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Data Flow Diagram

Transcript: Data Flow Diagram Made by: Sarah Lohamor What is DFD? What is DFD? A DATA FLOW DIAGRAM (DFD) illustrates how data is processed by a system in terms of inputs and outputs. As its name indicates it is the flow of information, where data comes from, where it goes and how it gets stored. DFD Notations DFD Notations Notations are the way you present something, for example: Reshma and Rahul use squares to represent their processes whereas I use circles to represent my processes. These data flows are the inputs and outputs of the DFD and are known as notations. External Entity External Entity An external entity can represent a human, system or subsystem. It is where certain data comes from or goes to. It is external to the system we study, in terms of the business process. For this reason, people used to draw external entities on the edge of a diagram. Process Process A process is a business activity or function where the manipulation and transformation of data take place. A process can be decomposed to a finer level of details, for representing how data is being processed withing process. Data Store A data store represents the storage of persistent data required and/or produced by the process. Here are some examples of data stores: membership forms, database tables, etc. Data Store Data Flow A data flow represents the flow of information, with its direction represented by an arrowhead that shows at the end of flow connector. Data Flow Importance of DFD Importance of DFD DFDs can provide a detailed representation of system components. DFDs are easier to understand by technical and nontechnical audiences Provide functional breakdown of the system A straightforward graphical technique which is easy to recognise. Example Example

Data Flow Diagram

Transcript: DFD components Data Flow DFD Targets DFD Data Flow Diagram is a graphical representation of flow of data through information system DFD can be used to visualize a data processing DFD shows what kind of data will be input to the system and what data is received as the output. Data Store There is no communication between external objects There is no communication between the data stores - data store communicates with the process. There is no communication between objects and external data stores. There are no black holes. A black hole is a process that takes as input information packets and does not generate anything on output There are no magical processes. Magical process is the process, which doesn't have any input, but generates output. Identification of key external objects which interact with the system Identification of key processes occurring in the company Determine how the information and data flow between processes Identification of data packets, which should be stored in data warehouses. Good practices External entity (terminator) Number the processes Less number of processes Avoid complex DFD's All flows, which appeared on the diagram of higher level should be included at a lower level diagram On the lower level there are additional flows between processes and data stores, and between the new processes, which arisen as a result of decomposition processes at higher level. Represented graphically by an arrow Shows the movement of information packets A flow carries only one type of packet and is represented by the flow name DFD grammar Plan Introduction Also knows as bubble, function or transformation Shows the part of the system that transforms inputs to the outputs DFD Grammar Data Flow Diagram Context diagram Thank you for your attention DFD targets What is DFD? Good practices Process DFD definition Low-level diagrams (1 and 0) DFD Components Models a collection of data packets that are at rest Acts as a storage area for two processes that occur at different times or simultaneously Flow from the store is interpreted as access to read the information from the store Flow to store is interpreted as write, update or delete Represents external entity with which the system communicates Can be a person, or a organisation, department within the organisation or some other computer system Source - Entity that supplies data to the system Sink - Entity that receives data from the system

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